Necticut



(No Model.)

J. H. BARNES 82: J. H. WOOLASTON.

KEY.

No. 353,113. Patented Nov. 23, 1886.

fl I? W 11 3 Z .74 C?) 02 Q WLMAZJ/ ML%ZWW 9Q N PETERS.Pholo'Lilhcgraphur. Walhinglun, DQC,

UNIT D STATES PATENT 7 OFFICE.

JOHN H. BARNES AND JOSEPH H. WOOLASTON, OF NE\V HAVEN, CON- NEOTIOUT,ASSIGNORS TO THE BARNES MANUFACTURING COMPANY, OF

SAME PLACE.

KEY.

SPECIFICATION forming part of Letters Patent No. 353,113, dated November23, 1886.

Application filed August 9, 1886.

T0 aZZ whom it may concern.-

Be it known that we, JOHN H. BARNES and Josnru H. WooLasToN, of NewHaven, in the county of New Haven and State of Connecticut, haveinvented a new Improvement in Keys; and we do hereby declare the following, when taken in connection with accompanying drawings and the lettersof reference marked thereon, to be a full, clear, and exact descriptionof the same, and which said drawings constitute part of thisspecification, and represent, in

Figures 1, 2, and 3, side views of the keys, showing the projection onthe side of the bit in different positions; Figs. 4, 5, and 6, keyholescorresponding to the keys of Figs. 1, 2, and 3, respectively; Fi g. 7, atransverse section through the bit.

This invention relates to an improvement in keys, and particularly tothat class known as flat keysthat is, keys cut complete from sheetmetal-and adapted for locks having a cylinder slotted to receive the tipof the spindle,with an opening from the slot into the case to admit thebit.

In locks of simple construction for the useof this class of keys themechanism of one lock is the duplicate of another, andto prevent thekeys being interchangeable the edges of the bit are notched and theinterior of the case provided with corresponding projections, and thenotch in the bit and the projection in the case made in differentpositions in different looks, so that only the key having a notchcorresponding to the projection in the case can be used; but in thisconstruction the notches make sharp angles in the edges of the bit,which-are undesirable in a key to be carried in the pocket. In anotherconstruction of this class of keys the bit is bent so as to give it acurved shape from the spindle downward, and the case having acorrespondingly-curved key- Serial No. 210,388. (No model.)

hole the key is only adapted to that particular look; therefore byvarying the curves a variety of keys and locks may be produced in whichthe keys are not interchangeable; but the objections before mentionedare only increased by the curvature of the bit.

The object of this invention is to construct the keys without either thenotches or bends, but yet so that they are not interchangeable.

A represents the shank of the key, with the usual loop, a, and the bitI), cut from sheet metal, and all fiat and in the same plane.

On one side of the bit a small and preferably hemispherical projection,d, is formed of considerably less extent than the width of thebit, andpreferably by striking in from the opposite side, so as to force themetal outward to form the projection, as seen in Fig. 7. tion of theprojection on the bit may be varied with relation to the spindle,asshown in Figs. 1, 2, and- 3, and it may be on either side. The side ofthe key-hole in the case is constructed with a recess corresponding inposition to the projection on the bit fitted for that particular lock,as shown in Figs. 4., 5, and 6.

By this construction it will be seen that a number of looks with thesameinechanisin may be readily arranged so that the keys are notinterchangeable, and without changing the shape or plane of the bit atthe edges, and

therefore avoiding the difficultics before mentioned.

We claim The herein-described key,having its bit constructed with aprojection upon its side of less extent than the width of the bit,substantially as and for the purpose described.

JOHN H. BARNES. JOSEPH H. \VOOLASTON.

Witnesses:

Orro C. WENCK, FRED O. EARLE.

The posi-'

